TG2: Radiation - Impact of applications

TG2: EM radiation - Impact of applications

EM radiation = Electromagnetic radiation

Visible light is just one type of electromagnetic radiation present in the EM spectrum.

Open Ended

Can you name another type of EM radiation?

Type of EM radiation

Each of these types of EM radiation have their own uses & applications.

Open Ended

Can you name one example of a type of EM radiation & how it is used?

Visible Light

• The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. 

• Light allows us to carry out our daily activities even when it is dark.

• Plants use visible light to carry out photosynthesis.

Multiple Choice

Leaves appear as green because...

• It absorbs green light.

• It reflects green light.

Multiple Select

Which are the 2 main wavelengths of light absorbed by plants during photosynthesis?

(Do a quick search!)

• Red

• Orange

• Yellow

• Blue

• Violet

Open Ended

What are some harmful effects of visible light?

Infrared Radiation

• Although we cannot see it, we encounter infrared radiation every day by detecting it as heat.

Open Ended

State one use of infrared radiation.

IR is also used in IR sensors!

Read the section 'Fun Fact' on pg 27 of your textbook

Although IR is useful, overexposure to IR is also harmful.

• Burns during welding, molten metal production, furnaces, etc.

• Workers who have prolonged exposure to IR must wear goggles to protect their eyes.

• Climate change - IR trapped in the atmosphere

Open Ended

State a harmful effect of climate change.

Ultraviolet light

Although UV waves are invisible to the human eye, some insects, such as bumblebees, can see them.

Bug zappers use UV light to attract them.

Multiple Select

Which of these are applications of UV light?

• Sterilising medical equipment

• Produce Vitamin D

• Skin cancer